RuggedCom RS1600 Manuel D’Utilisation

Chapter 7 – Configuring Multicast Filtering 

Chapter 7 – Configuring M

ULTICAST 

F

ILTERING

 

Introduction to Multicast Filtering 

RuggedSwitch™ accomplishes multicast Filtering through the use of the Internet 
Group Management Protocol (IGMP) snooping.  

IGMP is used by IP hosts to report their host group memberships to multicast 
routers.  As hosts join and leave specific multicast groups, streams of traffic are 
directed to or withheld from that host. 

The IGMP protocol operates between multicast routers and IP hosts.  When an 
unmanaged switch is placed between multicast routers and their hosts, the 
multicast streams will be distributed to all ports.  This may introduce significant 
traffic onto ports that do not require it and receive no benefit from it. 

RuggedCom switches with IGMP Snooping enabled will act upon IGMP messages 
sent from the router and the host, restricting traffic streams to the appropriate 
LAN segments. 

This chapter familiarizes the user with: 

•  IGMP Terminology and Issues 
•  Configuring IGMP Snooping 
•  Viewing IGMP Snooping status and statistics 
•  Troubleshooting IGMP Snooping 

IGMP Features 

RuggedCom IGMP provides you with the following features: 

•  Industry standard support of IGMP (RFC 1112, RFC 2236) versions 1 and 

2 in active and passive roles. 

Note: RuggedSwitch™ IGMP Snooping supports 

•  IGMP may be enabled on a per VLAN basis. 
•  Multicast Routers may be statically configured or dynamically recognized. 
•  “Routerless” operation. 
•  Support of up to 256 multicast groups.

RuggedCom 

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